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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19a41e7390c7d7a8688218da10b8d93339e3b4555301c65b5174b989ad8ac2d' 
  AND token = 'M/ZpIT6z0jR7bAPeBSCBo+JMwrSlSkv26XW217/k/Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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