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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299614f3a2124aab7106d2e741ee1ef3480f3f415571b9a7a7a78c3999678953' 
  AND token = '6Ewxzda1DNQantUigVwu+uJe3/ITasWHu1q6Xz4ZbWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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