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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e6ceb8b978dd2a92f5c309e4d797a1272dfb3e523b7bd7804219e186d016ba' 
  AND token = 'k+683UhZVaX2mRl7ecsx09MnzmlBPpKZwUAgOzKt5vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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