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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9585593efa7c746c438bf55a95ba01ed446fd8475b5c9d56d1d769821e3c808' 
  AND token = '/g0s01CzbBpCNj7adbxQnPHMhvxwGAeGkMtmwDQxm4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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