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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8aa6749c86d659724adbf1e589a1d6563a6d736c85dede12c83f9ecb345182' 
  AND token = 'biRdqGIoJ5zaskv417Vq340Hyy6NNAuQWSX7cVSqmnw=' 
  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"
    }
  }
}