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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef565b6735b72ebd5bd8bc5165f6ff73de185bd5b1a05c71c6bf4db84b598144' 
  AND token = 'X4i76b+2NJiBHJwhIIi4S1FDenwjAIf6hwdID9Ab/+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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