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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fc7e82bb24b0338daf8d1806499bb0cab371113762eece923527cf9de8994e' 
  AND token = 'p3Zhe4zl4aeq7lTuPy3wSsQYcAcBgrRVCENd8bY96pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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