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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe53854a7e07d26f5f8fcea846cbcf28bbecf00b82aafbd9d768ca5ee1f58ab' 
  AND token = 'smhiD/4npw+SVlDaLQ2C63TekljW6U14hryJOxuFnQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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