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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d363a733c3865f9145b41fd031ad800f7ac694f651bfe5f16f4e9386f4987aa' 
  AND token = 'z+XqN/X/nLVCXQWU6CUtDyL1WQufA//ZXOmBorQdPIs=' 
  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"
    }
  }
}