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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ecf90f0275fe8c318ecda1834a75de9d4f32ad61364f18b857e10f2810af50' 
  AND token = 'YY3v725XCQVM8lKoNueILnD5m56ZvEt8Wt6mFUoTyis=' 
  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"
    }
  }
}