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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a0d2d4fc4f0d4841743a8ca6733ac028525382ceb98b04006e1c2b88ca6ae9' 
  AND token = 'd44p/plYVqPX8Cc5gmLh6Xdo+ki4a6Qk2Gh+zgW+N0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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