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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9294d3e5d49f3cefe5a06d89263a677a38ef53a31f023e63c401013a8efbf1' 
  AND token = '/As7nKPlTgNLkVBLdIYAfvdDblpiu4Ti1DwLppPkpOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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