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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e584b5e1309d587f569dc97da26d342a936cfdb2374becbc4ecd6616d19746' 
  AND token = '0OKFgiUF8ayipE2Bv05zmp6u/NTZePd4MAiIfHUT8nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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