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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd303d4e4efc8e50b350b03638640fae922a7809a7d98bc02cc90078705637870' 
  AND token = '8Ll8iOlqePjfY0+fT5n5i4JfSa7lx8CZ044GSM2hlbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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