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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de6fd8a8abc48c40e8e1c3e199635f6c2b45016b240c4cd7dd9e9889d3350cf' 
  AND token = 'QJ4ONTng+tkWdQ0vTVO6GAUZGHNZx7FpibBw1LeNN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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