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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6556231a7b1c4b610cfba706b2ab244754b1eab54d662e852f210bc4cb029d2' 
  AND token = 'VU8j2GTR+iYac7gQmgJfcN/uhkgiAxtU0GSC6BUAGzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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