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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c19787f767e019b758a9cf84b6bad569f1befd207ca6cae6d38f0f336b2c3cb' 
  AND token = 'lPQcJ3VbfoQN0RajT+a8gm1fqN2t/kwANc81pBZfx6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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