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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eb55b2cfae3a5db8d70e2634ff07bff88923dce49821b848b86afa7630a846' 
  AND token = 'hd6B4ke7scw8kyXl5t0EtHpONkC6sc2m1PDeZF2Nb2E=' 
  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"
    }
  }
}