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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b191503a409b4a41d2c9fcab403d36e0fc3ab97fc76ed2050b2d869762645acc' 
  AND token = 'Q5+lbJiiYCx2ldtds0XT4S6Ub9owWcYDJlotPZzGbig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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