SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d29920b40840693c22471f5f9375f2faf077ea95c3b2e7e0bb96c3814805eef' 
  AND token = 'jsmTRv1uYfy8y78Zo+URDY2OoBJFvhdmyWVfwKCCTnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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