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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de4810e66d0dadcadca07b234d9011b6cf8dfe3fd8b8c243c75b90b39066de6' 
  AND token = 'JaLEL9Nzo6ooznH9qRMf97qBGqX9LDuccEQxxsU7bmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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