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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeaeff94793e3ca422eec63959322c9fbab521a2439288d985f69d3c4d519bb' 
  AND token = '3PtzZxPktu0wb6Ph0AWl215s0t1Kt9vkGV/9qEigroo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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