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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ccdac6d6c2d6217f77b242e5713f06686d2093e80b3605bf6f02cbe7d22194' 
  AND token = 'Y9jY5sBQq+cTmcmRgUVZYp/XTVDddbyUOFkinwwYxuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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