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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfd2ac4df47aacb8ab6fb5c941a4a54f3b05df1b946fa9e0592752d74408b6b' 
  AND token = 'rkfkB/hH5399+3OhxIIzUCAdP/HELbaNGBTDQQaEN0Q=' 
  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"
    }
  }
}