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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e2432e74914964a01fc26b6ba164cfd7cf99a40faee5d7eb7155b5bad5efb3' 
  AND token = 't5piWG4Z9HhuBtN3yS7QRy8S1Dx/7MyQH2yq4j7U4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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