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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e80a4aec8112c74afbc961c6f47dd8a035da487d9c49e5033375c5afa5908a' 
  AND token = 'BKm3vyLdMjXgc+EHgzPVGp19KPF+mbxIamHM+DnNW+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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