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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddc17bb07e621a0dc7b28ebae963e677b2efba85d1c98b024ea2169679c63ff' 
  AND token = '/z8KxI2m1iLoajeqSSLguXuu61sFxQkWRiwN2AvAN/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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