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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c862d562b3806b9abc73e1089ac16fbc70eb862f4ceb3764d86f63383e0f21f' 
  AND token = 'e4AkGHnIV1RK7ESYYhGIBfsVgP7yMBr+xzNBQbYDl54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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