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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c042e26655ba9db05dc02db3fb054edcdac3c0398100f762ea4d82e58c79c0' 
  AND token = 'WdfyTxDaF+XbnCwjWEvhfadSJcws13k4V5niLGuDsT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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