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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be11fa38680732d05b655fd2c17808f4f590c23203e17a84e9f8e3c7425e720f' 
  AND token = '2Eo50iBelEgZp6HX73k8g0QYO7EP+zsx4AWjOqCB6XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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