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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c01994ba85351f98836f9b307f15fbae329382c5f125a6151ae8e2d11158b2' 
  AND token = 'ajRz+dyIEPwXAon8eG7fiifZ6TY9h5ca7ulGJBkbW5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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