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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0982676f4d9a516279470222cd73e2e03dfad463f875be0af60cceccf34d9e' 
  AND token = 'Nn9WG4XHvicO6mYWu+r9jJ6f0lVpn+pV5E67EzOHuO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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