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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b90ce082fa167882e2bc84b55560e6514d788c3cde42b039ed62b2b96acc44' 
  AND token = 'JAO3FEjmSd62ol/A5KoApytSvQuu8p9u4Kt48NDsDeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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