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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17265ee7ea2d78fe45d4b898dd2c031edd5f2e27bbf03a8bb59cf4fc6d57c9a6' 
  AND token = 'lVyzNHEy8qzJG7vpZYbH6ASol14LBkBWOdF5YnvK8S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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