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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2abf37fa22aa7cd74aee680341bba5177e9f4bd6db61694a93e85d04412047' 
  AND token = 'Qu5yuufRz/gRxmRlMsd7MSiQ2JWq6DHSguXDsRssr30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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