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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e81e42a09f350a26d3154ed9a5047e04d84a6124f13dbad4729f94f3d3150d' 
  AND token = 'kcoB5utNQjhxfwZH4qAJpqs+b7fZhB4vAh+cO9PH9Go=' 
  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"
    }
  }
}