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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8caed210933abd27fd18533305e07c47f418712512f80e7dc7b04a0efa2642e4' 
  AND token = 'hNZQ5VNFz5MXiz2rDU1B7Vg+WUU4rf3ObozDffluDX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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