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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264c094a6835701bd8c2c5d4f33c0cb7c153154aa24cddf1fbe718cdbf2876ea' 
  AND token = 'e0WkY3E6SqmfcqfDHZ2hQCqV7xnFIvje9dBx0duuv3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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