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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9b55a5ea4c62798575bb4cb76aa4810537d0b651fbc113f3067556539d9bf3' 
  AND token = 'On2oI6Upa4o5E4tLEf45YTb38Y4Y3UIV51lXWp9TvWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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