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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f528cb98b6c022e0e36adde4237930286080c3d88222f044f8a97b10f93a933' 
  AND token = 'EeF2vFx9J+dJTnbADMIOqy9mDeQFd2R1NJZ8OzJofKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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