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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0713acc79d7c9cd8515edfa75b0c0efa91d5e7fbed141679a7dcb56ed07d733' 
  AND token = 'cfBnJHRAG6XOLi+YLcIkXjvQqk2rKVlAEBlUeVdPgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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