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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60facd18c15d26f94a3e09fee8afde9078e4e9233d50bae83f916843dd1e3a0f' 
  AND token = 'ROeJ1/XxEgvY5JX2KqfZ7EE+gdQmSiutNNs/iSIK+wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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