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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21360347c9ce76027e34897fc3b4dfb9656db86403cc582ecd8e31d9a706514c' 
  AND token = 'cEEH5uR4kOLk7TayrpVlm7W5q6y1ScvusP+Gpjbkvvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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