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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febc5fc573c3b50947bb8e99ad587f8253b138e76da1f9634ccf4207f0984b77' 
  AND token = 'nB4cBY6CFlXCgWVyeTF4C+CmW5DE1DDkY7wnLeiIoFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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