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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4734f106a3084eaeccfaa2a31f7b0a4c42362b826a4be05dfbaaf0a455c639e7' 
  AND token = 'K8hv7oNi6LnHyaItirVj8lxpJqckNLUT2sUgb5uTwAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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