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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd269dd40a9db04ae320c6ff286ff33da60353513854bdc054f47d9e7b6af32' 
  AND token = 'JGg4Yg1noq7iliF223fHIJcMf7zLD4mQNxjuQmLesB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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