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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3197c38a7ffd3f9b7011b03a98cdebe2e4a8d7cf5d451d8749e55b01a8312189' 
  AND token = '46/KflmYXP27O3vQ3rHcaGy59Zj+FsIYa9QjGbYMgdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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