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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbba02613ddf16429769e5e56d9569f606525b16684a6cf04476c0119df080d' 
  AND token = 'bY9XV04w9H2wO2Q0rAS3J5d5MYFQv+kZ3ODfNq02xso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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