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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c6ae643a32d8d27e8b8579922b61dab2cacde9e41875430de1d97f80fd62ef' 
  AND token = 'uGMiSXpuDqim/pRGFr14r1geSwgEzNaD/vE+iEJfHTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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