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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aad2e84f9fb5d7af4ea415913c00287b6e618f7832fc4c903b0522d63fb588' 
  AND token = 'zOMV7FPHDt3v25uJQvJBeGRSdzJIjZ0Fu9t6DefnfvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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