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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497596afb4eff0a9e1317ea0f2e0a0de25bb05f720267b06dcbfa5cd1dd64f4b' 
  AND token = 'x9A0AaY0PrYz6cuU9CwHSZ+nc3LwW1pSjbD+Oohu29Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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