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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c810d491efb553bc7225c88bb08084775d9fef6fd4225497a6a9bdbc7b40f89' 
  AND token = '78wjB8tRLOsTSxjJ/dN7Db4A8pV+vTbzwNCaCcCzNUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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