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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2108f9349b8b1067c3459f026feeb5e2a563e198205b4c4dcef2ffa2bea4ad' 
  AND token = 'VFJvc+dt2sMLRheUzhlyl6vl2W3T4KFzfTeW1HTKOlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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