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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d6f8ec534f55d77b6d9d7f09e88b02b331b58e6e9a90948d08810e73450c32' 
  AND token = 'J677hTalR1RSVdZt+N5iSbcMxzFo8rkSORTTmxHWsS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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