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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9558679ad4e24d18c2016747eb4602477165b93b5c5b3882fd9edc8c5b0ef5' 
  AND token = 'tGWoFb+NemMJ4CCK8ch11SAeF5j8t/HnYO0t8jVH3yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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