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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d45389307d629b5342eaf103689dbbe507c8d9de461d60bff4e83c601ba8c84' 
  AND token = 'GNhC4H6xN6l0EEx47jz0r0KT2C7mus7Uy93Cvu6TnzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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