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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716435652bd1d558460f28356c1a655b37ec72f74becf00043563d13fe560b92' 
  AND token = 'EdB8N5H5ka2mfEy+4K560AP2Lh+ZtX6M+uHnTehKGiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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