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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf22c78da926b1cd9d0b50be61b51d5124d09d56d1a97cc2171be341f18b5928' 
  AND token = '69MGAbcMEqDVLH6AP8QuRwrUg5rT3PR/HwZFESOpC40=' 
  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"
    }
  }
}