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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e0cb9dd9767edb9261561ebf8adf48ba5e01c76fd63ecd9c18961def6238a8' 
  AND token = 'HBeiJcJwS/Wj2roH7erTc7GUMok8CVfRpJxckqwxzpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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