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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd5c2c23238e9627e55613cd11839fd26afc9cba870ed5e3b4f8a32ffa50d6d' 
  AND token = 'd5czC68e0h3FnQM1gmH1HyMfFNF5eOOt2xmF8gvf/fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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