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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137b956d8e9d9793b49d0f55c4890fb90d26155e2659d2625f68de1e2fcd6522' 
  AND token = '/IadWhvnlD3Dqvtn40yU7myOTp0DjjduQIUx98rZ7mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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