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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e421595df3e6d94056f55636d56b627e703c612b0d6c2920b436c3d255634a94' 
  AND token = 'C2Jf0122kDwJqEf12t0TJbqR6LF+mj5dtkAdOJ2hnGs=' 
  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"
    }
  }
}