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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb69d545135cea71d076d83a1652bf949f04c3b120dedbc2f57e7d7c2f883df' 
  AND token = '7Ywg4minmFD6VKtJ4e30f8ao5lGvMI+29/8CysDrpVo=' 
  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"
    }
  }
}