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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8faa431b181b171c4ce9f0e5c8edaf56927002cecd5c5b7e795881744cd0ee' 
  AND token = '7dP0EjV1BeO5VjRxY2MfRpn/X+drovPJYKoAsE60fbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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