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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef35c8dcf1e380ee9455f37827332356511be22b79612b9418caa9c7e1d953b0' 
  AND token = 'Xt/zSEKO/EeNJBhCZcSkgEtwLf8yqkp3g648BTD22yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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