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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56d6b192ab0d1f86dc24b9076ee670d91812ed96a0c36376090b520972d820a' 
  AND token = 'PAqqtxKyKDnKK2WkVGceCsgXUrTCoK/k+j6JeZJefj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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