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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6d890ba6eab1a446e6533fb2b94a760f6fb81dbd30689565975c3ba1bfc26e' 
  AND token = 't6R+BCq8nk6TQZ9a8617v8VrnqU0Z4enrBSa/SaXFjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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