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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8b4136a561bbc9cadf179de100760824399e8b6d9f790b8a2565f9c9b6ccc9' 
  AND token = 'uxktlLqb3X5SfxhXZhkW7Q8/2MlmXzdzBNPcqsHkNik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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