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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756932a14cf4312715d2c2aec3b2b43290b68b49ced37e62d3873a8414270fb6' 
  AND token = 'R7My1EAs9YbTMJa0KU/0Ycym68I8x1HdrrLt4raFBTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}